pico-8 cartridge // http://www.pico-8.com
version 41
__lua__
-- sprite-sampled palette
-- kistaro@gmail.com

function _init()
 -- lock top 16 rows to default palette
 pal({[0]=0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}, 2)
 poke(0x5f5f, 0x10)
 poke2(0x5f70, 0xffff)
 
 mode = "boxes"
 active = "sprite"
 scx = 0
 scy = 0
 dcx = 0
 dcy = 0
 
 init_box_pals()
 init_rows_pals()
end

function boxspr(x, y)
 return 1+x+16*(y\2)+(y%2*0.5)
end

function init_box_pals()
 box_pals = {}
 for x=0,box_cols-1 do
  local pal_col = {}
  for y=0,box_rows-1 do
   pal_col[y] = load_box_palette(boxspr(x,y))
  end
  box_pals[x] = pal_col
 end
end

function init_rows_pals()
 rows_pals = {}
 for x=0,rows_cols-1 do
  local pal_col = {}
  for y=0,rows_rows-1 do
   pal_col[y] = load_row_palette(
     8+16*x,
     16+2*y
   )
  end
  rows_pals[x] = pal_col
 end
end

function _update()
 if (btnp(🅾️)) mode = (mode == "boxes") and "rows" or "boxes"
 if (btnp(❎)) active = (active == "sprite") and "draw" or "sprite"
 if active == "sprite" then
  if (btnp(⬆️)) scy -= 1
  if (btnp(⬇️)) scy += 1
  if (btnp(⬅️)) scx -= 1
  if (btnp(➡️)) scx += 1
 else
  if (btnp(⬆️)) dcy -= 1
  if (btnp(⬇️)) dcy += 1
  if (btnp(⬅️)) dcx -= 1
  if (btnp(➡️)) dcx += 1
 end
 scx %= (mode == "boxes") and box_cols or rows_cols
 dcx %= (mode == "boxes") and box_cols or rows_cols
 scy %= (mode == "boxes") and box_rows or rows_rows
 dcy %= (mode == "boxes") and box_rows or rows_rows
end

function _draw()
 cls()
 draw_hud()
 local pals = (mode == "boxes") and box_pals or rows_pals
 pals[scx][scy]:do_both(0)
 pals[dcx][dcy]:do_both(1)
 draw_bars()
end

function draw_hud()
 pal(0)
 pal(1)
 if (mode == "boxes") return draw_box_hud()
 draw_rows_hud() 
end

function print_shadow(s,x,y,c)
 print(s,x+1,y+1,1)
 print(s,x,y,c or 7)
end

function lpad(str,w)
 str=tostr(str)
 while (#str < w) str = " "..str
 return str
end

box_rows = 4
box_cols = 4

function draw_box_hud()
 spr(1,3,0,4,2)
 local toff = time() * 4 \ 1 % 2
 spr(107 + (active == "sprite" and toff or 0),
      3+8*scx,4*scy,1,0.5)
 spr(109 + (active == "draw" and toff or 0),
      3+8*dcx,4*dcy,1,0.5)
 
 print_shadow("spr",42,1,12)
 print_shadow(lpad(boxspr(scx,scy),3),42,9,6)
 sspr(8+8*scx,4*scy,8,4,55,4,16,8)
 
 print_shadow("draw",73,1,14)
 print_shadow(lpad(boxspr(dcx,dcy),3),77,9,6)
 sspr(8+8*dcx,4*dcy,8,4,91,4,16,8)
end

rows_rows = 8
rows_cols = 2   

function draw_rows_hud()
 spr(33,0,0,2,2)
 spr(35,22,0,2,2)
 local toff = time() * 4 \ 1 % 2
 spr(103 + (active == "sprite" and toff or 0),
     17 + 22*scx, 2*scy, 0.25, 0.25)
 spr(105 + (active == "draw" and toff or 0),
     17 + 22*dcx, 2*dcy, 0.25, 0.25)

 print_shadow("spr",48,0,12)
 sspr(8+16*scx,16+2*scy,16,2,61,2,32,4)
 
 print_shadow("draw",44,8,14)
 sspr(8+16*dcx,16+2*dcy,16,2,61,10,32,4)
end

function draw_bars()
 for i=0,15 do
  local i6 = i * 6
  rectfill(0,16+i6,128,i6+21,i)
 end
 for i=0,15 do
  for y=16,120,8 do
   spr(i+112,9+i*7,y,0.625,1)
  end
 end
 for y=16,120,8 do
  spr(111,120,y)
 end
end
-->8
-- palette structure

palette = {
 -- cols: table. identical
 --       format to table-type
 --       pal call
 
 --   tr: transparency table.
 --       keys: [0]..[15]
 --         (color indexes)
 --       vals: true/false/nil
 --         for transparency of
 --         that color. false
 --         sets opaque, nil
 --         means "do not set".
 --       tables with no absent
 --       values can be compiled
 --       for faster do_palt.

 -- cpl_tr: compiled tr. set by
 --       compile_palt iff all
 --       tr values in range
 --       are nonnil. do_palt
 --       is faster this way
}
palette_mt = {__index=palette}

function palette.new(x)
 x = x or {}
 if (not x.cols) x.cols = {}
 if (not x.tr) x.tr = {}
 setmetatable(x, palette_mt)
 return x
end

function palette:do_pal(p)
 pal(self.cols, p)
end

function palette:do_palt()
 if (self.cpl_tr) return palt(self.cpl_tr)
 local tr = self.tr
 for i=0,15 do
  if (tr[i] ~= nil) palt(i, tr[i])
 end
end

function palette:do_both(p)
 self:do_palt()
 self:do_pal(p)
end

function palette:compile_palt()
 self.cpl_tr = nil
 local bits, tr = 0, self.tr
 for i = 0,15 do
  if (tr[i] == nil) return
  bits <<= 1
  if (tr[i]) bits += 1
 end
 self.cpl_tr = bits
 return bits
end
-->8
-- load palettes

function load_box_palette(sidx)
 local sint,sfrac=sidx\1,sidx%1
 local x0,y0=sint%16*8,sint\16*8+sfrac*8\1
 local cols,tr={},{}
 for i=0,15 do
  local x,y=x0+i%4,y0+i\4
  local c,f= sget(x,y),sget(x+4,y)
  if (f&0x1 ~= 0) c += 128
  if (f&0x2 ~= 0) tr[i]=true
  if (f&0x4 ~= 0) tr[i]=false
  if (f&0x8 == 0) cols[i] = c
 end
 local ret=palette.new{cols=cols,tr=tr}
 ret:compile_palt()
 return ret
end

function load_row_palette(sx, sy)
 local cols,tr={},{}
 for i=0,15 do
  local c,f = sget(sx+i,sy),sget(sx+i,sy+1)
  if (f&0x1 ~= 0) c += 128
  if (f&0x2 ~= 0) tr[i]=true
  if (f&0x4 ~= 0) tr[i]=false
  if (f&0x8 == 0) cols[i] = c
 end
 local ret=palette.new{cols=cols,tr=tr}
 ret:compile_palt()
 return ret
end
__gfx__
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